package Hash;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ThreeSum15 {
    public static void main(String[] args) {
        System.out.println(threeSum(new int[]{-1,0,1,2,-1,-4}));


    }

    public static List<List<Integer>> threeSum(int[] nums) {
        List<List<Integer>> resultList = new ArrayList<>();
        Arrays.sort(nums);
        for (int i = 0; i < nums.length; i++) {
            if (nums[i] > 0) {
                return resultList;
            }
            if (i > 0 && nums[i] == nums[i - 1]) {
                continue;
            }
            int left = i + 1;
            int right = nums.length - 1;
            while (right > left) {
                int sum = nums[i] + nums[left] + nums[right];
                if (sum > 0) {
                    right--;
                }
                else if (sum < 0) {
                    left++;
                } else {
                    resultList.add(Arrays.asList(nums[i],nums[left],nums[right]));
                    while(right > left && nums[left] == nums[left+1]){
                        left++;
                    }
                    while(right > left && nums[right] == nums[right-1]){
                        right--;
                    }
                    left++;
                    right--;
                }
            }
        }
        return resultList;
    }
}
